Electrical regulator.



A. A. TIRRILL.

ELECTRICAL REGULATOR.

APPLICATION man OCT. 5. 1911.

1,252,Q6QB Patented Jan. 1, 1918.

J5 his ATITORNEYI i .110 nd are drawn into engage- 23 being somewhatdelayed by the dash potv 28. Upon engagement oi the contact terminals 9and 1.0, the resistor 8 in the exciter field circuit is shunted and theexciter field strengtlii and voitage are thereby increased. The increaseof the exciter voltage is followed by an increase of the generator fieldstrength and voltage, with the result that the winding 19 is morestrongly energized, the contact terminal 13 is thereby moved out ofengagement with the terminal 12.

@11 account of inductances of the re- "Ve field circuits of the exciterand the t the c ange the voltage of the resulting from the or 8 in heexciter field erially after the said ion 3 occurred. In order hatervoltage not be on followed by fluctuation or not the rela r is providede the resistor 21 19 a short time creating" of the resistor "Jr :icidcircuit, and to open the 21 subsequentto Ire shunt to the resistor 8 ga. shunt to the resistor mitte TI to flow through the res it that itwill ized to enact separation and "13 i ior to the time ation W0 inoccur it brought i y an hmrease of the voltage of --3-le The variouscorrespondact to of the regulator are e and. out of engagement in suchnaaaoeo manner that the excitation of the enciter is governed so as tomaintain the voltage of the distributing circuit .23i substantiallyuniform or at a required value, and also so as to restore the samepromptly to a condition of equilibrium after it has been changed, as,for instance, by a sudden fluctuation of load.

Since the present regulator operates to effect thedesired regulation byadjustment of the field excitation of the generator, it is evident thatit may be employed for regulating in accordance with variations of anyother electrical condition of a generator or circuit than the voltage bysimple and obvious changes of the connections of the Winding 19, or bythe substitution therefor of other suitable means for varying theposition of the terminal member 17, all Within the spirit of the presentinvention I claim as my invention:

The combination with an electrical circuit, and a dynamo-electricmachine associated therewith, of a regulator for the dynamoelectricmachine comprising coiiperating contact members, an actuating Windingtherefor energized from said circuit, and re .lay devices controlled bythe contact members for governing the field excitation of thedynamo-electric machine and; the degree of energization of the saidWinding, the latter relay device being retarded in its operation.

In testimony whereof, l: have hereunto subscribed my name this 3rd dayof October, 1911.

ALLEN A. TIRRILL.

Witnesses @Tro S Screamer, B. B. Hines,

